Unable to see rendered View even after adding HDRI and exr files
Since the World Output node doesn't have a red header and the World Properties show that a background node is connected, you have another World Output that is active. You will have to remove the duplicate output in the node editor, that is likely somewhere outside the visible area. All nodes can be brought into the view through View > View All (Home or pos1).

The proper node setup for HDRIs is shown in the following image: